Description:
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According the documentation ( http://php.net/manual/en/uconverter.getaliases.php ) the parameter $name of UConverter::getAliases() is optional, but we get a warning if we call this method with no parameter ( https://3v4l.org/ERNFW ).
The parameter should be documented as mandatory.
Test script:
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<?php
var_dump(UConverter::getAliases());
Actual result:
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Warning: UConverter::getAliases() expects exactly 1 parameter, 0 given in /in/ERNFW on line 2
bool(false)